ScubaFett

I have a mate who said he got it working after watching this guide -

I am stuck on the loading screen - I'm unsure of what version i'm using because at the server selection screen, it says my version is 1.60 but one of the files i downloaded from the DayZ website was dayz_code_v1.7.0.rar. How do I install a different version? All I did was follow the youtube install guide on the website exactly and still no game?????